/* ================================
   VIM-INSPIRED MOBILE-FIRST THEME
   ================================ */

:root {
  --bg: #0d1117;
  --fg: #c9d1d9;
  --accent: #58a6ff;
  --border: #30363d;
  --error: #f85149;
  --hover-bg: #21262d;
  --alt-bg: #161b22;
  --font-body: monospace;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--fg);
  margin: 0;
  padding: 0 1rem;
  line-height: 1.6;
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover, a:focus {
  text-decoration: underline;
  outline: none;
}

/* Accessibility */
.skip-link {
  position: absolute;
  left: -999px;
  top: -999px;
}
.skip-link:focus {
  left: 0;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.75rem 1rem;
  z-index: 1000;
}

/* Layout */
header, footer, main, section, nav {
  padding: 1rem 0;
}
header {
  border-bottom: 2px solid var(--border);
}
footer {
  border-top: 2px solid var(--border);
  font-size: 0.9rem;
  text-align: center;
}

/* Navigation */
nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
nav a {
  display: block;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
}
nav a:hover, nav a:focus {
  background: var(--hover-bg);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
  font-size: 0.9rem;
  overflow-x: auto;
  display: block;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.6rem;
  text-align: left;
  white-space: nowrap;
}
tr:nth-child(even) {
  background: var(--alt-bg);
}
tr:hover {
  background: var(--hover-bg);
}

/* Forms */
input, select, button {
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
}
button {
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
  transition: background 0.2s ease;
}
button:hover {
  background: #79c0ff;
}
input:focus, select:focus, button:focus {
  outline: 2px solid var(--accent);
}

/* Error message */
.error {
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 0.25rem;
}

/* Tablet and up */
@media (min-width: 600px) {
  nav ul {
    flex-direction: row;
    justify-content: flex-start;
  }

  body {
    padding: 0 2rem;
  }

  main {
    max-width: 800px;
    margin: 0 auto;
  }

  th, td {
    font-size: 1rem;
  }
}

/* Desktop and up */
@media (min-width: 992px) {
  nav ul {
    gap: 1.5rem;
  }

  body {
    padding: 0 3rem;
  }

  header, footer {
    padding: 1rem 0;
  }
}

/* Nav toggle button */
.menu-toggle {
  background: none;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  font-family: inherit;
  cursor: pointer;
  margin-bottom: 0.5rem;
  border-radius: 4px;
  width: 100%;
}
nav {
  display: none;
}
nav.open {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Vim-style flash */
.focus-hint {
  animation: blink 0.15s ease;
}
@keyframes blink {
  0%, 100% { background-color: #0d1117; }
  50% { background-color: #161b22; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-5px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Desktop layout */
@media (min-width: 600px) {
  .menu-toggle { display: none; }
  nav { display: block !important; }
}

/* ================================
   DESIGN NOTE
   ================================
   Inspired by Vim's minimalist power,
   this theme embraces the mindset of a
   backend developer — structured, efficient,
   and distraction-free. The monochrome palette
   mirrors a coder’s terminal, while accents of
   electric blue evoke focus and logic. The layout
   starts mobile-first: simple, readable, and
   performance-oriented — like clean, optimized
   code. Think of it as data structures meeting design.
*/